I think you are wrong Valter.
In Socialist Federal Republic of Yugoslavia cadets of School for reserve officers were in age 19 - 27.
It should be the same in Kingdom of Yugoslavia.
Leigh,
thank you for posting your picture.
Man in the center of the picture is obviously an officer and others are cadets of the School for reserve officers.
Civilian is probably of muslim nationality according to his cap called "fes".
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